Introduced property com.openexchange.subscribe.microformats.allowedHos ts to file 'microformatSubscription.properties' which allows to specify a comma-separated list of accepted host names (supporting wild-card notation); e.g.
com.openexchange.subscribe.microformats.allowedHos ts=*.open-xchange.com, localhost, 127.0.0.1
com.openexchange.subscribe.microformats.allowedHos ts=*.open-xchange.com, localhost, 127.0.0.1